Sound signaling



O 17, F. VON VOIGTLANDER 2,060,911

SOUND SIGNALING Filed May 25, 1933 2 Sheets-Sheet 1 Nov. 17, 1936.

F. VON VOIGTLANDER SOUND S IGNALING 7 Filed May 25, 1953 2 Sheets-Sheet 2 I .inllllll Patented Nov. 17, 1936 UNITED STATES PATENT OFFICE 2,060,911 soUNn' SIGNALING Frederick Von 'signor to Schwarze Electric Company, Adria Voigtlander, Adrian, Mich, as-

2 Claim.

This invention has utility when incorporated in electric sound signaling, especially in horns 23 within the offset 5.

for motor vehicles, marine work, alarms, code signaling, etc.

Referring to the drawings:

Fig. l is a side elevation of of the invention in a horn;

Fig. 2 is a section on an enlarged scale of a portion of the horn in Fig. 1;

Fig. 3 is a section on the line III-J11, Fig. 1;

Fig. 4 is a view on the line IV-IV, Fig. 2;

Fig. 5 is a section on the line V-V, Fig. 4;

Fig. 6 is a front view of a trumpetless horn;

Fig. 7 is a view of the horn of Fig. 6 from the rear with the cover shown in section and with vthemechanism open or ported toward the diaphragm;

Fig. 8 is a section on the line VIII- VI1I Fig. 7; and a Fig. 9'is a wiring diagram of the electric circuits for the horn disclosure herein.

Tapering projector l is shown with flare portion 2 having ofiset 3 to radial flange 4. .This flange 4 terminates in outer offset 5 embracing rim 5 of diaphragm.'l. This diaphragm 'I has central opening 8 through which extends bolt 9 having head ill mounting armature H as spaced by washer H from the diaphragm 1. Remote from the head tion l3 mounting nut l4 which acts on spring washer l5 against loading disk or resonator l6 having cup portion I! to rim l8, having clearance relatively to the oiiset 3 and located within the taper portion 2 of the projector. This resonator i3 is spaced from the diaphragm l by washers I9, 20, 2i; The rim l8 accordingly has a desired clearance relatively to the diaphragm 1 against contacting such diaphragm.

Bolts 22 through the projector flange 4 assemble the rim 6 of the diaphragm l with flange This flange 23 is of housing having cylindrical flange portion 24 with inwardly extending portion 25 .to central flat portion .26 having eccentric opening 21. About an embodiment this eccentric opening 21 is disk 28 against which nests expansion washer 29 at nut-30 on threaded stem 3i 532, having winding 33 as a coil about this stem spool 32 has shoulder, 34 through opening 33 in bottom 36 of cup having side walls iltupwardly terminating in'rim 38 adjacent the armature ll and concentric therewith. The opening 35in the In, this bolt 9 has threaded poras an adjustable core in spool cup bottom 36 is eccentric of this cup bottom 38 and eccentric of the diaphragm 1, while the armature ,II and the bolt 9 are concentric of the diaphragm I.

It is thus noted that while the 'cup 36, 3l,is mounted eccentrically as to its mounting with 5 the housing, its actual rim portion 38 is concentric oi the armature II, as well as the diaphragm 1. This cup side portion 31 is provided with lateral port 31 for leads 39, 40, from the coil 33.- Diametrically from this port 31', the 10 side wall 31 of the cup is provided with port 4|, through which extends spring leaf 42 carrying insulation plate 44 as a mounting to be contacted by stem 45 fixed with the armature ii, eccentric of this armature ll, diametrically 15 opposite from the eccentric position of the core 3|. This stem 45, as movable with the diaphragm l and the armature H as actuated by the electro-magnet with the core 3! as well as the cup and energized by the coil 33, shifts this 20 plate 44 away from the projector and thus moves contact 46 on the leaf 42' away from contact 41 and plate 48.

This contact 46 has its conducting circuit through the leaf 42 mounted at v insulation 25 washers 49, 50, at terminal bolt 5|. The plate 48 has insulation 52 at mounting bolt 53. Insulation 54 remote therefrom is at adjusting screw 55, with which coacts expansion helical spring 56. This bolt 55 as adjusted may shift 30 the plate 48 and thereby determine the location of the contacts 46, 41, for the action of the interrupter stem 45. It is to be noted that the lead 39 from the coil 33 extends to this plate 48, and that the lead 48 from this coil 33 extends 35 to the terminal 511.

Instead of the trumpet type of projector l of Fig. 1, there may be adopted 'a trumpetless type of front 51 (Fig. 8). In lieu ofthe housing having the electro-magnet of coil, cup and core 40 inward from its externally access'ble and adjustable core 3| as shown in Fig. 2, there may be housing 58 over main frame 59 having cup 60 about the coil 33. In this instance, the interrupter 45 is within the cup, while the contacts 45 45. 41, are outside the cup but within the shell or housing 58 as assembled with the frame by screws M. This main frame 59 is shown with ports 52 therethroughto the diaphragm I, thus 60 providing added capacity chamber 63 in the shell 58 over the capacity of chamber 54 within the frame 58 toward the diaphragm I. It is thus. noted that this chamber 64 region is of less capacity than chamber 65 (Fig. 2). Armature 66 55 (Fig. 8) is concentric with the diaphragm I but eccentric of the core 3|.

The amplitude of vibration for the diaphragm is increased due to the provision of the ports 62. The back cap or shield 58 not only provides definite increase in the chamber capacity for affecting the tone of the horn-but serves as a shield to protect the working parts from mechanical injury and weathering attack. By locating the striker pin or interrupter 4.5 within the magnetic field, there is minimized tendency to distort the diaphragm in operation, especially transversely of the extent of the diaphragm. This follows because the interrupter stem is located toward the central portion of the armature instead of at the edge portion thereof. Spring leaf #2 accordingly has a longer leverage arm for flexing which increases the mechanical advantage for the diaphragm as the actuator thereof. Additionally, there is a better magnetic distribution at the continuous rim 38 of magnetic pull on the diaphragm with relation to the opposing forces of diaphragm resistance in itself due to resilience, as well as due to air in the chamber.

What is claimed and it is desired to secure by Letters Patent is:

1. In a sound signal, a cupped casing, a di aphragm closing one end of the casing, a cup shaped magnetic member secured in the casing with its open end extending toward the diaphragm and concentric thereof, an armature secured to the diaphragm concentrically thereof and overlying the edge of the cup shaped mem ber, a magnet, coil and core secured in the cup shaped member with one end adjacent the armature, the magnet unit being substantially smaller than the inside of the cup shaped member and situated near one side thereof, interrupter contacts for the coil having an operating member extending into the cup from the side opposite to that on which the coil is situated and a contact actuator secured to the armature and bearing on the contact operating member at a point adjacent the side of the coil.

2; In a sound signal, a casing, a diaphragm closing an end of the casing, a magnetic member secured in the casing, extending toward the diaphragm and providing rim means concentric of the diaphragm, an armature secured to the diaphragm concentrically of the diaphragm and overlying the rim means of the member, a mag- FREDERICK VON VQIGTLANDER. 

